Fluid control



L. S. HAMER FLUID CONTROL Nov. 6, 1951 2 SHEETS-SHEET l Filed Nov. 23, 1945 Nov. 6, 1951 L. s. HAMER FLUID CONTROL Filed Nov. 25. 1945 2 SHEETS- SHEET 2 INVENTOR. 6. Haz/ver A Homey l Leland Patented Nov. 6, 1951 FLUID coN'rRoL 'l Lelands. Hamer, vLong BeachQCalf., assignor of One-fourth to4 Paul A Dewhrst,-` Los Angeles,

Application Noyember 23, 194s. serial `630,506

, l This invention has to do with a iiuid and has particular reference to .a device` useful in a pipe line, or the like, to-controliiow therethrough, and is generally in the nature of a line blind. It is a general object of the presentin- 1 acens: (cr. iii-161i fj control vention to provide .a device of .the Vcharacter if mentioned Vwhich is of. simplified, improved and practical construction, making it useful in yvarious situations where line blindsl or the like are desired.

The device of the present invention is the general nature of a pipe line fitting and is more specifically an angle` type of fitting, that ..is, a fitting wherein there are sections that areV tubular and which are angularly. related relative Vto each other. The present .invention contemplates rz an angle fitting wherein the sectionsqare-at any desired angle. However, as a typical example of the invention I will describe it as a right angle fitting. that is, a fitting wherein the sections are at right angles to each other and, further, the particular fitting that I have shown ,is in the nature of a T.

A general object of my invention is to provide a fitting of the general character referred to having an improved operating means whereby I gain a very effective closing or clamping action through a very simple, easy operation. The structure that I have provided involves, generally, a differential `operating means or a thread device involving diierential thread means, and f when the device is operated the clampingmember is operated slowly but with great force.

Another object of the present invention is to provide a fitting of the general character referred to which has a catch chamber at the point where the control or blinding plate ignarried, so that fluid is not spilled from the fitting in the course of changing or manipulating nthe plate.

Another object of my present invention isto f rprovide a tting of the general character referred to involving any operating means for the plate clamp which means is located entirely at the exterior of the body or free of the fluid passages so that flow of iiuid is in no. way vimpeded or interfered with. f .:l I

Another object of my present invention is to provide a vfitting ofthe general character referred to in which the operating for-ce is generated by or from a single screw member and is communicatedto the plate clamping member yso;that,it is operated positively and uniformly and with a minimum of structural deflection. In -thegconstructicnthat I have provided I employ a plurality oftie rods that extend to and operatethe member that clamps the plate and the tie 4rods are-symmetrically arranged around the axis of the plate clamp and they are located immediately adjacent the exterior of the body section to which the plateis clamped,O so that Vthey exertv force to the clamping member at lpoints y,closeA Vto its central axis.

The various objects and features of my invention will be fully understood from the follow- ;ing detailed description of typical preferred forms and applications of the invention, throughout,whichV description reference is made to the accompanying drawings, in which:

Fig. 1 is a plan view of a pipe line fitting embodying the construction that I have provided, the particulanfittingi shown being a T fitting. Fig.' 2is an end view of the device shown in Fig.

1, being a view taken as indicated by line 2--2 on Fig. `l. Fig.g3 is an enlarged longitudinal sectional View of the device, being a view taken as :indicated byline 3--3 on Fig. 1; Fig. 4 is an enlarged detailedsectional view of a portion of the vstructure shown in Fig. 1, being a view taken as lindicatedbyline 4.-4 on Fig.` 1. Fig. 5 is a transverse sectional viewiof the structure, being a view Ataken as indicated by line 5 5 on Fig. 3. Fig. 6

.isa transverse; sectional view of the structure, being a viewtaken as indicated by lline @-6 on Fig. 3.Y Fig. 7 is a detailed View illustrating the differential screw mechanism that I have pro- -vided,` parts of the Vmechanism being 4broken away toshow in section. Fig. 8 is an enlarged detailed sectional view showing the' manner in -whi'ch the plate is sealed with the body and clamp gmembenr.; Fig. 9 isa view similar to Fig. 8 showing a.jmo'diedvv form of construction, and Fig. 10

fazview'similar to Fig. 4, showing a modified ,longitudinal tubular section B. I am referring to A,the section B aslongitudinal since it extends in .th'e directiongof. the central axis of the mechanisin. that I1 have provided. In accordance with aste 842 3 the broader aspects of my invention the fitting may be in the nature of an L as distinguished from a T, in which case the section A which is referred to as transverse, is open at one end only. In the preferred form of the invention the body sections A and B are cast or otherwise suitably formed lintegrally or as a unit, and where the body is to be connected with 'or to other "parts, such as to pipe sections, it is provided with suitable coupling means. In the particular form of the invention illustrated the body section A :is provided at its ends with coupling flanges Il)V while the body section B iis without a coupling flange, since it does not connectfdirectly'to"aniother part or pipe line, but rather carries the clamp member which, in turn,1is provided withY a coupling flange, as I will hereinafter describe.

ifor drain from the fitting when the plate is being changed or operated. It is to be understood, of course, that the housing 25 will not retain fluid if there :isi'a headtpressure on the fitting, but will onlyV hold 1i-uid if 'there is fluid standing in the The construction that.I have provided involves.

in addition to the body having sections A and B, a HOW `control plate C,`a elampmmb'erSD foperable to clamp the plate1again`s`taseat provided ato'r onthe body 'B'sealihg means 'E atthe 'plate vto fprevent leakage of fluid at the plate, an operating mechanism F and connecting means G ibetween the operating mechanism fand the clamp member. l

In the `preferred form of my present invention the plate receiving seat `is -formed'lon ror by the -body section 2B. In fa'c't, -lit Sis "preferably formed at or by the outerend of the body'section B, which end -islnorm'al to the longitudinal axis of the section B-or tothe iiuid vpassage l2 'through the section B. f.

The control plate C may be any suitable blind or control plate, such `-as iis -used inline blinds 'or the like. As an example fof 'la fcontrol plate I have shown one yhaving t'wo ends, one a closed end 'i4 andthe other an lopen end `I5, 'the open end being provided with -a -bore -or iaperture :I6 for 'passing fluid. AInfp'rac'tice'th'e bore 'I6 of "the control plate may vbe of any desired `sire relative tothe owpassage provided in the body of y'the -iitting In the lparticularcase illustrated I have shown an aperture I5 in Ithe IpIa'teLpart yI5 ycorre- `spondingfinsize-toltlie bore I2'of 'section B Vofsthe 'The clam-p -'member D Vthat I have .provided 1`is carried by the Vouter 'or projecting end portion of the 'body sectionB vand when in .place it forms or'may'be-'cnsidered apart or extension of the Vbody section, although -it is operable `to move relative to Vthe portion of -the-bodysection B tha't 'is Ajoined to the body section-A. Theclamp member `in its preferred -form is afcollar-like `element -or housing 25 which surrounds the clamp face 2l and 'projects from the inner end of the collar to overlap the projecting outerend of the body 'section B. lIn the preferred construction theiexterior 26 of the outer end portion 'of the body section B is turned and 'slidably ts into a'bore -21 provided in the enlargement or housing portion 'of the clamp member so that the projecting end of the section B projects into the housing.

-The housing is completely enclosedexcep't 'at one side where itvhas a lateral side openingz3llwhich is wide enough :to vadmit lthelplate C. -Thenplate line without beingfunder pressure.

'Ihe sealing means E provided between the 'plate and the'sea't' TI or the clamp face 2l, or b`oth,may vary depending upon the Working conditions or the type of fluid being handled and in practice I may u'se any suitable or vappropriate fformfor type of packing. In Figs. 3 and 870i the drawings I `show a construction ywherein both sides of the .plate -at both .portions thereof 'are `plain and smooth, While the `seat has a channel I35 formed therein carrying apacking ringSG and 'the clampfa'ce has a channel 31 formed therein ycarryingapacking ring 38. The packing rings 36 and 38 project Ifrom the seat and face, respectively, to have sealing engagement with the plate, as shown lin the drawings.

In -the kmodified form of construction illusv-trated lin Fig.'9 the seat `I Ia is plain and smooth and the clamp'face 2|@ isplain and smooth, but the..plate Chas a channel 35a formed therein carrying a .packing ring 3la to 'engage the seat l IEL while the other side-of the .plate has a chan- -nel 3la formed therein carrying a packing ring y38u-to engage the clamp 'face 21a.

In the .preferred `form of my invention I pro- -videpa'cking 'means or a `sealing ring 45 between the housing portion l25 of the clamp member and the projecting end of the body fsectionB. `In the particular case Aillustrated in the draw-ings the .packing ring "40 lis carried in a channel 4l provided lin the Wall of the bore provided in the heus ring 25 to receive the turnedend portion 25 of the `body section B.

vThe loperating means F that I Ihave provided ypreferably involves a single manual control or operating member 45 and -a screw means or differential screw mechanism'by Ywhich I gain a substantial mechanical advantage or leverage. The .'preferredfform of mechanism as 'shown in theK drawings involves,;generally,a head 45 which rI Willrefer to asranouterfmember, a lstud 4l which I will refer to as an inner member., and a single rotatabl'e screw member 48 engaging and operating betweenthe head andstud. A'Ihehead 45 is a movableor shiftable part to which the connecting means G is'attachedthrough lugs 43 of the head. I may strengthen the lugs 43 by means of 'fribs 44 :and I support the head 46 so that vit is guided Afor movement in the desired direction. In the particular 'construction shown a projec- `ltionf49 is provided on'the body and has its outer fisurface 50 `tur-ned concentric with the axis-of the mechanism that I am describing, which axis is concentric with that of the opening I2 vin section y.B and the opening |12a in the clamp member, which `registers with and isthe same size as the opening lvl2. The operatingrmember 45 is secured lto the 'screw member 48 by action of the screw threads 45a on lthe operating. member engaging 'with .therscrew threads 48a on thescrew member.

The operating member and thes'screwm'embe'r are held against rotation relative to eachother by means of screws12a which key these two elements together and further vsecure a plug 12 which I will hereinafter describe. The head 46 has a bore or socket entering it from its inner end, which socket slidably receives the outer surface 5|) of the projection 49.

The stud 41 is a stationary or fixed element projecting outward from the projecting part 49 and arranged concentric with the mechanism that I am describing. The screw member 48 connects the head 46 and stud 41 by being externally threaded and screwed into a central bore 55 provided in the head and by being internally threaded and screwedonto the stud 41. The threads 56 on the outside of the screw member 48 are pitched in the same direction as the threads 51 on the inside of the screw member. HoweVen'they differ in number, that is, there is a different number of threads 56 than there aro threads 51 for a given length of the screw member. For example, in practice I may provide about 11 threads per inch on the inside of the screw member 48 and l0 threads per inch on the outside of the screw member 48.

The stud 41 may be fixed on or made to project from the projection 49 in any suitable manner. In the case illustrated I have shown the stud formed separately from the projection and have shown the screw threaded into an opening in the projection and a transverse pin 412L xes the stud against displacement from the projection.

The operating member or hand wheel 45 is directly connected to the screw member 48 to turn it and in the preferred construction a protective shield 60 is provided on the hand wheel to slidably extend over the projecting turned outer end portion 6| of the head 46. The sleeve 60 is made long enough so that it is maintained over the part 5| of the head 46 throughout operation of the mechanism. In practice it is desirable to maintain a lubricant in the screw mechanism that I have just described and it is preferred to construct the mechanism so that foreign matter is kept out of the screw mechanism. In the particular case illustrated a sealing ring 1U is arranged between the turned part 50 of the projection 49 and the bore 5| of the head and a sealing ring 1| is provided between the projecting part 6| of the head and the protective sleeve 60 of the hand wheel. A plug or closure 12 is provided to close the outer end of the tubular screw member 48 and a suitable grease fitting or connection 13 is provided so that a suitable lubricant can be introduced into the screw mechanism. Passages 14 may be provided to facilitate the flow of lubricant to the moving parts.

The connecting means G that I have provided may' vary considerably in construction and formation. Broadly, the connecting means acts as a tie between the head 46 of the operating mechanism and the clamp member D which engages the plate C. In the preferred form of my invention the connecting means G is located. or arranged entirely at the exterior of the body so that there are no parts whatever projecting into the uid passages lestablished by the body sections A and B. In the form of invention shown in Figs. 1 to 7, inclusive, the connecting means involves a plurality of tie rods 15 to extend between the lugs 43 of the head 46 and the clamp member D'. In the construction illustrated there are four studs 15 and these studs `are equally spaced around the axis of the operating mechani'sm F and are equidistant from the axis ofthe mechanism F. In accordance with my invention I connect the rods 15 to the clamp member -D `so that they do not reach or intersect the plane of operation of the plate C. In the construction illustrated bosses 16 project from the inner end portion of the clamp member D or from the housing 25 toward the head 46. The bosses have tapped openings 11 and the tie rods have reduced threaded end portions 13 which are threaded into the opening' 11 so that the ends 19 of the tie rods seat against the outer ends 89 of the bosses. Through this construction the rods are effectively connected to the bosses in a predetermined position and project rigidly therefrom toward the head 46. The head 46 has lugs 43 strengthened by the ribs 44 and has openings 90 passing the reduced end portions 9| of the tie rods 15 so that the ends 92 of the tie rods seat against the surfaces 93 of the lugs 49. The reduced end portions 9| of the tie rods are threaded and extend beyond the lugs 43 sufficiently to carry the nuts 94. In practice the tie rods may be bolt-like members having ends 19 and 92 which properly space the clamping means D from the head 46.

The guide lugs 8| project from the body section A and in practice are part of and are integral with the body section. The tie rods 15 slidably pass through the openings 82 in the guide lugs to engage the head 46. Through the mechanism just described the clamping means D is held rigidly against rotation relative to body sections A and B and the mechanism F.

In the form of the invention illustrated in Fig. 10 of the drawings I provide for adjusting the clamp member D relative to the head 46. In this form of construction the tie rods 15a may be connected to the clamp member D by threading into the bosses 16a and slidably pass through the guide lugs Sla on the body section A. The lugs 43a 0f the head 46 have openings 9|]ab passing the threaded end portions Sla of the end portions 9|a to adjustably connect the head 46 to the clamping means D. Through this construction the tie rod 15a and the nuts 94Bq and 95su can be adjusted to vary the spacing of the clamp member from the head and any inequality or misalignment can be compensated for through suitable manipulation of the nuts on the tie rods.

In operating the mechanism that I have provided, assuming the clamping member D to be released or backed away from its clamping position, the desired end of the plate C is arranged between the seat and the clamp face 2 I, the operating member 45 is then turned in a direction so that the threaded engagement between the screw 48 and the head 46 causes the head to be moved out or inthe direction indicated by the arrow in Fig. 3. When the screw member is turned in this direction the screw member is bodily advanced inward or toward the body because of its being threaded onto the xed stud 41. The difference in number of threads, as above described, results in a differential movement or action so that the actual movement of the head 46 relative to the body of the fitting is very slight and, consequently, there is a very great mechanical advantage set up between the operating member 45 and the head 46. As the head 46 moves in the direction indicated by the arrow in Fig. 3 the clamp member D through the connecting means G moves toward the body section B so the clamp face 2| bears toward the plate C and clamps the plate on the seat l, ,The

sealingfmeans` E provided inthe vclamp.y plate .assures a tight connection so that. there isno leakage around the plate and the .differential mechanism makes it possible to clamp the plate C with great .force so that the fitting will withstand very high pressures. To change the plate Cor to reverse its position it is merely-necessary to move the operating member d in the opposite direction, causing the head 46 to move in the opposite direction or toward the body of the ttingwith the result Athat the clamp member D is .pushed away from the plate C, releasing the plate so that it is free to be handled as desired. If the -tting is installed as above described, the housing 25 catches any fluid that would otherwise spill when the clamp member D is released, assuming, of course, that there is no head pressure on the tting.

Having described only typical preferred forms and applications of my invention, I do not Wish to be limited or restricted to the specii'lc details herein set forth, but wish to reserve to myself any variations or modifications that may appear. to those skilled in the art and fall within the scope of the following claim.

Having described. my invention, I claim:

1. In a. device of the character described, a rigid body with an elongate portion having a flow passage thereinand with a laterally projecting portion at one side of the elongate portion and having a now handling ductv in communication with the passage, the projecting portion having an annular seat concentric with the duct, a flow controlling plate having-sealing engagement with the seat, and means operating the plate relative to the seat including, a single .rotatable element at theopposite side of the elongate portion of the body and having concentric diiierential threads, the body having a part connected therewith and engaged by one of the threads and means cooperating with the other of said threads and associated with said plate to eiect said sealing engagement between said plate and said seat.

2. In a device of the character described, a body having a ilow passage, a closure engaging the body to control flow through the passage, and means operating the closure relative to the body including, a manually operated operating member and diierential screw means acting between the operating member and the closure, the screw means including, an externally threaded part rigid on the body, an internally threaded part coupled with the closure and communicating force thereto, and a rotating screw member having threads of diierent pitch engaged on the rst mentioned part and in the other Dart.

3. In a device of the character described, a body having a now passage, a closure engaging the body to control iiow through the passage, and means operating the closure relative to' the body including, a manually operated operating member and differential screw means acting between the operating member and the closure, the screw means including, an externally threaded part xed on the body, an internally threaded part coupled with the closure and communicating force to the closure, and a rotating screw member threaded onto the first mentioned part and into the other part, the threads of said parts being pitched in the same direction and differing in number so the said other part is moved to operate the closure when the screw member is rotated.` f

4, In a device of the character described, a

body havinga ii'owl passage, a closure engaging the body tocontrol flow through the passage, and means operating the closure' relative to the body including, an operating member and differential screwmeans acting between the operating member and the closure, said means including, an externally threaded fixed stud projecting from thebody, an internally threaded head concentric with the stud and coupled with the closure to communicate force thereto, and a screw member threaded onto the stud and into the head, the threads of the stud and head being dierent.

. 5. In a device of Ythe character described, a body having a ow passage, a 'closure engaging the body to control ow through the passage, and means operating the closure relative to the body including, an operating member and differential screw means acting between the operating member and the closure, the screw means including, two parts one internally threaded and the other externally threaded, and a screw member having threaded engagement with the two parts, one of the parts being xed to the body and the other being movable relative to the body and coupled to the closure to shift it relative to the body, the threads ofY said parts being of different pitch.

6. In a device of the character described, a body having a ow passage, a closure engaging the body to control flow through the passage, and means operating the closure relative to the body including, an operating member and differential screw means acting between the operating member and the closure, the screw means including, two parts one internally threaded and the other externally threaded, the threads of said parts being of different pitch, a screw member having threaded engagement with the two parts, one of the parts being xed relative to the body and the other movable relative to the body and coupled with the closure to shift it relative to the body, and means guiding the movable part relative to the body.

7. In a device of the character described, a body having a ow passage, a closure engaging the body to control flow through the passage, and means operating the closure relative to the body including, an operating member and differential screw means acting between the operating member and the closure, the screw means including, two parts with' differently pitched threads, the threads of one of the parts being internal, a screw member having threaded engagement with the two parts, one of the parts being fixed relative to the body and the other movable relative to the body and operating the closure. and means sealing the threaded portions of said parts against foreign matter from the exterior of the device.

8. In a device of the character described, a body having a flow passage, a closure engaging the body to control flow through the passage, and means operating the closure relative to the body including. an operating member and differential screw means acting between the operating member and the closure, the screw means including, an externally threaded xed stud projecting from the body, an internally threaded head, means coupling the head with the closure, a screw member threaded onto the stud and into Vthe head and carrying the operating member and rotatable to move the head relative to the body, sealing means between the head and body, and sealing means between the operating member and head.

9. In a device of the character described, a body having a Viiow passage and a projecting guide part, a closure engaging the body to control ow through the passage, and means operating the closure relative to the body including, an operating member and differential screw means acting between the operating member and the closure, the screw means including, an externally threaded i'lxed stud projecting from the body, an internally threaded head shiftable relative to the body and operatively coupled with the closure, and a screw member threaded onto the stud and into the head, the head having an opening slidably receiving the guide part projecting from the body.

l0. In a device of the character described, a body having a flow passage and an external guide projection, a closure engaging the body to control flow through the passage, and means operating the closure relative to the body including, an operating member and differential screw means acting between the operating member and the closure, the screw means including, an externally threaded xed stud projecting from the body, an internally threaded head shiftable relative to the body and operatively coupled with the closure, and a screw member threaded onto the stud and into the head, the head having an opening slidably receiving the guide projecting from the body, the operating member being carried by the screw member and having a part slidably engaging the head.

11. In a device of the character described, a rigid body With an elongate portion having a ow passage therein and with a laterally projecting portion at one side of the elongate portion and having a flow handling duct in communication with the passage, the projecting portion having an annular seat concentric with the duct, a flow controlling plate having sealing engagement with the seat, and means operating the plate relative to the seat including, a rotatable operating member at the exterior of the elongate portion and at the opposite side thereof, a unit shiftable relative to the body and conned to the exterior thereof and having a head at the said opposite side of the elongate portion and a plurality of rigid rods extending from the head to the plate, and a screw operated by the operating member and having differential threads, one of the threads being engaged with the head, and a part on the body engaged by the other thread.

l2. In a device of the character described, a rigid body with an elongate portion having a iiow passage therein and with a laterally projecting portion at one side of the elongate portion and having a iiow handling duct in communication with the passage, the projecting portion'having an annular seat concentric with the duct, a flow controlling plate having sealing engagement with the seat, an annular clamp engaging the plate and holding it against the seat, and means operating the plate relative to the seat including, a rotatable operating member at the exterior of the elongate portion and at the opposite side thereof, a unit shiftable relative to the body and conned to the exterior thereof and having a head at the said opposite side of the elongate portion and a plurality of rigid rods extending from the head to the clamp, and a screw operated by the operating member and having differential threads, one of the threads being engaged with the head, and a part on the body engaged by the other thread.

13. In a device of the character described, a

body having a flow passage, a plate engaging the body to control flow through the passage, an operating member, a screw means operated by said member, and means operating the plate from the said screw means including a plurality of tie members operated simultaneously by the screw means and guides on the body slidably supporting and guiding the tie members from the body.

14. In a device of the character described, a body having a flow passage therethrough and having a seat at one end of the passage and a wall spaced from the seat and intersecting the axis of the seat, a plate engaging the seat and controlling flow through the passage, an operating member, a screw means operated by said member and supported by and at the exterior of said body Wall, and means operating the plate from the said screw means and into engagement With the seat including, a clamp member opposing the seat and engaging the plate and a plurality of spaced parallel tie members connected with the clamp member and operated simultaneously by the screw means to move the clamp the plate flow lpassage therein and with a laterally projecting portion at one side of the elongate portion and having a flow handling duct in communication with the passage, the projecting portion having an annular seat concentric with the duct. a ow controlling plate having sealing engagement with the seat, an annular clamp engaging the plate and holding it against the seat, and means operating the plate relative to the seat including, a rotatable operating member at the exterior of the elongate portion and at the opposite side thereof, the axis of rotation of said member being `coincidental with the longitudinal axis of the duct, a unit shiftable relative to the body and confined to the exterior thereof and having a head at the said opposite side of the elongate portion and a plurality of rigid spaced v parallel rods extending from the head to the plate and parallel with the longitudinal axis of the duct, and a screw concentric with and operated by the operating member and having differential threads, one of the threads being engaged with the head, and a part on the body engaged by j the other thread.

16, In a device of the character described, a body having a flow passage and a seat around the passage, a plate engaging the seat, a clamp member engaging the plate operable to clamp it to the seat, the clamp member having a housing the plate to the seat, the clamp member having a housing portion with an opening slidably receiving thev body and a side opening admitting the plate to position to engage the seat, an operating member, a screw means operated by said member, and rods operatively connecting the screw means and the clamp member.

18. In a device of the character described, a body having a flow passage and a seat at one end and around the passage, a plate engaging the l. seat, aclamp member engaging the plate operable to clamp it to the seat, the clamp member having a housing portion with an opening slidably re ceiving the said end of the body and a side opening Aadmitting the plate to position to .engage the seat, an operating member, a screw means ,op-A erated by said member, and tension rods connecting the screw means and the clamp member.

19, In a device of the character described, a body having a flow passage and a seat around tbe passage, a plate engaging the Seat, a clamp member engaging the plate operable to clamp it to the seat, an operating member, a screw means operated by said member, rods connecting the screw means and clamp member, and guide means on the body slidably supporting the rods.

20. In a device of the character described, a body having a now passage and an outwardly facing seat at one end of the passage, a plate engaging the seat, a clamp member having a part outward of the said end of the body engaging the outer side of the plate to clamp the plate to the seat and having a part inward of the said end of the body having sliding engagement with the body, and means operating the clamp member including spaced parallel operating rods at the exterior of the body and connected to the last mentioned part of the clamp member.

ai. 1n a device of the character described. a body having a flow passage and an outwardly facing Seat at one end of the passage,y a plate engaging the seat, a clamp member having a part outward of the said end of the body engaging the outer side of the plate to clamp the Plate to the seat and having a part inward of the saidend `of the body having sliding engagement with the body, and means operating the clamp member including spaced parallel operating rods immediately adjacent the exterior of the body and connected to the last mentioned part of the clamp member, and a single means acting to simultaneously move the rods.

22. In a device of the character described,` a body having a ow passage and an external seat at one end of the passage, a plate with its inner side engaging the seat, a clamp member having a part engaging the outer side of the plate to clamp the plate to the seat and having an inner part slidably engaging the body, and means operating the clamp member including spaced operating rods at the exterior of the body acting under tension and connected to the last mentioned part of the clamp member, and a single screw means at the exterior of the body simul taneously operating the rods.

23. In a device of the character described, a body having a ow passage and a seat around the passage at one end of the body, a plate engaging the seat, a clamp member having a part outward of the said end of the body engaging the plate to clamp it to the seat and having a part inward of the said end of the body slidably engaging the body, and means operating the clamp member including spaced parallel operating rods at the exterior of the body and connected to the 12 lest mentioned part of the clamp member, and a single differential screw means at the exterior of the body operating the rods.

24. In a device of the character described, a body having a liow passage and a seat around the passage at one end of the body, a plate engaging the seat, a clamp member having a part outward of the said end of the body engaging the plate to clamp it to the seat and having a part inward .of the said end of the body slidably engaging the body, and means operating the clamp member including spaced operating rods operating under tension at the exterior of the body and connected to the last mentioned part of the clamp member, and a single screw means operating the rods and including a head operated by a screw and carrying the rods to operate them.

25. In a. device of the character described. a body having a flow passage and a seat at one end, a plate engaging the seat, a clamp member having a part outward of the said end of the body engaging the plate to clamp it to the seat and having a part inward of the said end of the body, and means operating the clamp member including spaced operating rods at the exterior of the body and connected to the last mentioned part of the clamp member, and a single screw means operating the rods and including, a screw, a head operated by the screw, and means connecting each of the rods to the head for adjustment relative thereto.

26. In a device of the character described, a body having two angularly related tubular sections, one a longitudinal section having a seat at its outer end portion and a wall at its inner end transverse of the axis of the seat, a plate engaging the seat, and means clamping the plate to the seat including, a clamp member engaging the plate, screw means at the exterior of the body and carried by the said wall of the body, and spaced members at the exterior of the body connecting the screw means and clamp member.

27. In a device of the character described, a body having two angularly related tubular sections, one a longitudinal section having a seat at its outer end portion, a plate engaging the seat, and means clamping the plate to the seat including, a clamp member engaging the plate, screw means at the exterior of the body beyond the other end of the body, and spaced members at the exterior of the body connecting the screw means and clamp member, the said spaced members being symmetrically arranged around and equally spaced from the axis of the screw means and having sliding engagement with the body.

LELAND S. HAMER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,599,168 Duncan Sept. 7, 1926 2,340,499 Zachow .V .V Feb. 1, 1944 

